Geochemistry, Geophysics, Geosystems


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      Alteration at the ultramafic-hosted Logatchev hydrothermal field: Constraints from trace element and Sr-O isotope data

      N. Augustin, H. Paulick, K. S. Lackschewitz, A. Eisenhauer, D. Garbe-Schönberg, T. Kuhn, R. Botz and M. Schmidt

      Article first published online: 17 MAR 2012 | DOI: 10.1029/2011GC003903

      Key Points

      • Serpentinization Logatchev hydrothermal field
      • Controls of geochemical budget in a hydrothermal system
      • Fluid/rock and melt/rock interaction at the MAR
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      Abyssal hill characterization at the ultraslow spreading Southwest Indian Ridge

      Heather Sloan, Daniel Sauter, John A. Goff and Mathilde Cannat

      Article first published online: 4 FEB 2012 | DOI: 10.1029/2011GC003850

      Key Points

      • Statistical analysis of bathymetry and gravity data from Southwest Indian Ridge
      • Characterization of ultraslow abyssal hill morphology
      • Relationship of abyssal hill morphology to mantle temperature
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      Geochemistry of vent fluid particles formed during initial hydrothermal fluid–seawater mixing along the Mid-Atlantic Ridge

      Verena Klevenz, Wolfgang Bach, Katja Schmidt, Michael Hentscher, Andrea Koschinsky and Sven Petersen

      Article first published online: 22 OCT 2011 | DOI: 10.1029/2011GC003704

      Key Points

      • Particle formation is influenced by fluid chemistry and fluid dilution
      • There are other factors than thermodynamics influencing particle formation
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      In situ measurements of hydrogen sulfide, oxygen, and temperature in diffuse fluids of an ultramafic-hosted hydrothermal vent field (Logatchev, 14°45′N, Mid-Atlantic Ridge): Implications for chemosymbiotic bathymodiolin mussels

      Frank U. Zielinski, Hans-Hermann Gennerich, Christian Borowski, Frank Wenzhöfer and Nicole Dubilier

      Article first published online: 16 SEP 2011 | DOI: 10.1029/2011GC003632

      Key Points

      • Sulfide and oxygen co-occur simultaneously over bathymodiolin mussel beds
      • Temperature maxima are concurrent with sulfide maxima and oxygen minima
      • Long-term measurements show mussels are neither oxygen nor sulfide limited
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      Deciphering the ocean bottom pressure variation in the Logatchev hydrothermal field at the eastern flank of the Mid-Atlantic Ridge

      Hans-Hermann Gennerich and Heinrich Villinger

      Article first published online: 9 JUL 2011 | DOI: 10.1029/2010GC003441

      Key Points

      • Ocean bottom pressure from Logatchev hydrothermal field at MAR is analyzed
      • Medium-term variations are dominated by variations of oceanic origin
      • High-frequency variations dominated by surface wave interaction and earthquakes
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      Crustal thickness anomalies in the North Atlantic Ocean basin from gravity analysis

      Tingting Wang, Jian Lin, Brian Tucholke and Yongshun John Chen

      Article first published online: 31 MAR 2011 | DOI: 10.1029/2010GC003402

      Key Points

      • Gravity-derived crustal thicknesses were calculated for the North Atlantic
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      Fossil clams from a serpentinite-hosted sedimented vent field near the active smoker complex Rainbow, MAR, 36°13′N: Insight into the biogeography of vent fauna

      Franck Lartaud, Marc de Rafelis, Graham Oliver, Elena Krylova, Jérôme Dyment, Benoît Ildefonse, Remy Thibaud, Pascal Gente, Eva Hoisé, Anne-Leïla Meistertzheim, Yves Fouquet, Françoise Gaill and Nadine Le Bris

      Article first published online: 18 AUG 2010 | DOI: 10.1029/2010GC003079

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